Instance variables are declared/defined in a class but outside the constructor (s), method(s) and block(s). For memory management, when memory is allocated for an object in a heap, a slot for each of the instance variables is created. Further,...

Java

OOP

What is an instance variable ?

11 Dec 2023 by CPallini

See, for instance: Difference between Instance Variable and Class Variable - GeeksforGeeks[^].

Java

OOP

What is an instance variable ?

11 Dec 2023 by Member 16128751

Attributes or Properties: Instance variables represent the attributes or properties of an object. For example, if you have a class representing a "Car," instance variables might include attributes like "color," "model," or "year." Scope: The...

Java

OOP

What is an instance variable ?

11 Dec 2023 by Member 16161055

Memory Overhead : Each instance of a class with its set of instance variables consumes memory. If there are many instances with large sets of variables, it can lead to increased memory usage What I have tried: An instance variable is a variable...

Java

OOP

How to share the project file here ?

16 Nov 2023 by Dave Kreskowiak

You don't. The site does not allow uploading projects. That would take a lot of disk space and can easily be abused by those who are not trusted. You have to paste the code snippets relevant to the problem, not the entire file(s).

Java

OOP

How to share the project file here ?

16 Nov 2023 by Krish The Great

Being a beginner,I am having a lot of problems(errors and exceptions) in my java project. How do I share the project here(the files)? What I have tried: I am a beginner is Java oops programming and not able to figure out few problems in my...

Java

OOP

I want help writing the code

9 Nov 2023 by M Imran Ansari

We are here more than happy to help you, but you should try yourself to work on this assignment. Try yourself and come with the issue if you face any. Here is the link to understand the basic concepts of OOP with guide. Introduction to Object...

code-challenge

OOP

I want help writing the code

9 Nov 2023 by Richard MacCutchan

You need to show the code you have written, and explain exactly what help you need. But if you are expecting someone here to write the complete assignment for you, I am afraid you will be disappointed. This site is here to provide help, not to do...

code-challenge

OOP

I want help writing the code

9 Nov 2023 by User204

Write a class Commodity that contains the following attributes and methods: -A public data member Name of type string that represents the Commodity name. -A private data member Quantity that represents the quantity of the Commodity. -A public...

code-challenge

OOP

How to override a javascript function's default behavior

18 Jul 2023 by Shazma Batool

I am learning JavaScript. And this is an object that has two properties; 'color' & 'machine' and one method named 'particulars' Car = { color: 'Red', machine: 12, particulars: function() { return console.log(this.color); return ...

Javascript

OOP

How to override a javascript function's default behavior

18 Jul 2023 by Member 10601191

try the following. Car = { color: 'Red', machine: 12, particulars: function() { return console.log(this.color, this.machine); } } Car.particulars();

Javascript

OOP

What is the explicit use of 'this' keyword?

13 Jul 2023 by Samriddha Chowdhury

class Rectangle:Shape { double height; double width; public Rectangle(double height,double width) { this.height=height; this.width=width; } } class Rectangle:Shape { double rec_Height; double...

OOP

inheritance

What is the explicit use of 'this' keyword?

13 Jul 2023 by Graeme_Grant

Here is the link to the official documentation for the above usage: this keyword - C# Reference | Microsoft Learn[^] Quote: The this keyword refers to the current instance of the class.

OOP

inheritance

What is the explicit use of 'this' keyword?

13 Jul 2023 by FreedMalloc

The keyword 'this' tells the compiler that you are dealing with a class attribute and not some other variable of the same name. It also tells someone else reading your code that a variable being used is a class attribute and not some other...

OOP

inheritance

Dynamic Polymorphism: Key Concept to Master OOP

27 Jun 2023 by Bohdan Stupak

A look at what dynamic polymorphism is and how it is crucial to mastering OOP

Change a variable from another class (KIVY)

30 May 2023 by Muhammad ali Mansoor

Kv : value_input:value_input TextInput: id: value_input pos: 100, 100 : Button: on_press: root.clear() on_release: root.fill() MainWidget: : ...

Python

OOP

Change a variable from another class (KIVY)

29 May 2023 by Daniel Lidén

A simplified version of my problem is: : TextInput: id: value_input on_text_validate: root.value_input(value_input.text) : Button: ...

Python

OOP

(OOPPHP)uncaught error: call to a member function query() on string in C:\xampp\htdocs\proxy vragenmodule\functions\update.php:52

3 Nov 2022 by shady morsi

Im making an update page. To me it looks strange, because the query function in php is in-built and in my case it should work properly. But it doesn't. My code class update { function GetQuestion($question) { // Question ...

PHP

OOP

(OOPPHP)uncaught error: call to a member function query() on string in C:\xampp\htdocs\proxy vragenmodule\functions\update.php:52

3 Nov 2022 by Richard MacCutchan

Look at your code. You are using the variable $question in three different places for three different purposes ... $sql12query =$question->query("SELECT DISTINCT question FROM questions WHERE uniq_name='" . $question . "'"); ...

PHP

OOP

Write a program that inputs your age in years (integer only). The program should display your age in months, days, hours, minutes and seconds in java oop

23 Oct 2022 by OriginalGriff

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for...

Java

OOP

Write a class called linear to represents a linear equation (a x + b = 0).

5 Sep 2022 by #ODSDOMS

The class has the following methods: - A constructor with one tuple argument called coefficients to define and initialize two instant variables, a and b, with default values of 0. - getCoff method that returns a tuple of...

Python

OOP

Write a class called linear to represents a linear equation (a x + b = 0).

5 Sep 2022 by Richard MacCutchan

Quote: I don't know object-oriented programming Well you will not complete this assignment without some learning materials. Try The Python Tutorial — Python 3.10.6 documentation[^].

Python

OOP

"Method can be made static" May Hide OO Design Flaw

16 Aug 2022 by Bohdan Stupak

"Method can be static" Microsoft Code Analysis warning may hide a violation of object-oriented design

.NET

Dev

OOP

Hi, please assist on why my code is not running?

28 Jul 2022 by Thandeka Zulu

Compulsory Task 1 In this task, we’re going to be simulating an email message. Some of the logic has been filled out for you in the email.py file. ● Open the file called email.py. ● Create a class definition for an Email which has four variables:...

Python

OOP

Hi, please assist on why my code is not running?

28 Jul 2022 by OriginalGriff

To add to what Richard has - rightly - said: You should expect to get syntax errors every day, probably many times a day while you are coding - we all do regardless of how much experience we have! Sometimes, we misspell a variable, or a keyword;...

Python

OOP

Hi, please assist on why my code is not running?

27 Jul 2022 by Richard MacCutchan

You have the following errors, all of which Python tells you: At line 43: userChoice = "" But all the following lines spell it user_choice. At line 47: print(int(input("Enter index of email you want to read: ")) I think you...

Python

OOP

Dynamic Load and Execution of Workflow Activities in C#

14 Jul 2022 by Jaume González

Solution using reflection to dynamically load and execute C# code in a workflow context

What exactly class and object in OOP?

31 May 2022 by salam_verdim_alana_panyatkasi_olana

Hi guys, I want to understand what class and object really are. Please don't come to me with simple examples. For example, car class. What I want to understand is how they work. As we really know, everything is made up of classes and objects, but...

Java

OOP

What exactly class and object in OOP?

31 May 2022 by Richard MacCutchan

See Java Tutorials Learning Paths[^] where it is all clearly explained.

Java

OOP

How do I best update a datetime variable from two separate time/date edit boxes?

24 May 2022 by Will Sewell

I have two boxes that look like the link below: dateEdit_NightShiftEndDate and timeEdit_NightShiftEndTime[^] I populate these boxes with a variable called NightShiftEndDateTime. I'd like to edit this variable to the value set in the boxes when...

How do I best update a datetime variable from two separate time/date edit boxes?

24 May 2022 by OriginalGriff

Convert one to a Timespan, and then add it on to the original DateTime: DateTime start = DateTime.Now.Date; DateTime end = new DateTime (1970, 1, 1, 8, 30, 0); // Midnight is a good starter. // 8 hours, thirty minutes ...

[Solved] static and non-static init block in C++

22 May 2022 by Phoenix Liveon

��Is there a way to have this initialization block similar to Java that we could implement and run properly in C++. There were two types of init-block in Java: 1. init-block/raw-init-block, this will invoke at every new instance created. 2....

Send the data from textbox (form1) to listbox (form2)

13 May 2022 by Member 15635292

hello am making project to calculate the students grade i need to transfer the data from form 1 to form 2 and when i came back to form 1 and entered form 2 again the data can shown how can i do that using class?! What I have tried: ...

OOP

Send the data from textbox (form1) to listbox (form2)

13 May 2022 by OriginalGriff

Exactly how depends on the "relationship" between the two forms. Have a look at these, one of them will fit your circumstances. The form that creates an instance of another: MyForm mf = new MyForm(); mf.Show(); Is the "parent", the other form is...

OOP

To find sum of adjacent elements - method and array

25 Apr 2022 by Member 13661842

Given an array of integers, find the pair of adjacent elements that has the largest sum and return that sum Input Format: An array of integers containing at least 2 elements Output : An integer The largest sum of adjacent elements. Example For inputArray = [3, 6, -2, -5, 7, 3], the output...

Java

OOP

It's Not About How You Inject Your Services, It's About How You Test Them

18 Apr 2022 by Bohdan Stupak

A short take on brittle unit-tests and how to avoid them

How many hidden keywords in java?

6 Mar 2022 by Junior Frogie

As I know, there are 8 hidden keywords in Java. It's somehow stay invisible in your source code silently, such as this, extend Object, super, constructor, import system.lang, return. But there are still two left. I wonder what are they. Please leave your comment here.

Java

OOP

reuse: An Object Recycling C++ Class Library

23 Feb 2022 by Michael Sydney Balloni

Recycle objects that are expensive to create and improve the performance of your application

Is this code qualified as OOP in C++?

22 Feb 2022 by 1298201

#include #include // FUNCTIONS void menu(); void account(int option); using namespace std; string AccountType[] = {"", "CHECKINGS", "SAVINGS"}; string response; int AccountDetails[] = { 1234, // pin number 10000, //...

C++

OOP

Is this code qualified as OOP in C++?

22 Feb 2022 by I_M_R

Hello, As i see by checking whole code: That code declares a class and defines (the body) that class with private and public attributes and methods. That is all. That would be very nice to define classes in a seperate header file or source file....

C++

OOP

OOP throw two dice this.setsumtotal(); does not work

8 Feb 2022 by Cameron Grant 2021

Just been experimenting with a class in which two dice are thrown and the total values of the numbers shown are calculated. I am using OOP and setting the total to this.dice1 + this.dice2. However, when instantiating a Dice in another class the...

Java

OOP

OOP throw two dice this.setsumtotal(); does not work

8 Feb 2022 by Richard Deeming

You never call your setSumTotal function except from the constructor with two arguments. Either call that method from your setDice1 and setDice2 methods, or call it from the rollDice method. public void rollDice() { ...

Java

OOP

Is this code qualified as OOP in C++?

30 Jan 2022 by CPallini

In my personal opinion, it is an unfortunate example of OOP (the AccountSettings class acts on a global variables, like AccountDetails, AccountType).

C++

OOP

Is this code qualified as OOP in C++?

30 Jan 2022 by OriginalGriff

No, it isn't. Not even close. it looks like C code that has been "converted to C++" by changing printf to cout, and adding an irrelevant "class" is all. Go back to your recent tutorials and read your notes over again: you don't seem to have...

C++

OOP

Link-Time Optimization and Debugging of Object-Oriented Programs on AVR MCUs

6 Jan 2022 by Bernhard Nebel

Link-time optimization and debugging OO programs do not work very well together, at least on AVR MCUs.

[Solved] static and non-static init block in C++

5 Jan 2022 by Stefan_Lang

You seem to try and imprint another languages' properties onto C++, and that is never a good idea! My experience with java is limited, and I'm not sure what you actually have in mind, but the code you posted is clearly not the recommended way of...

[Solved] static and non-static init block in C++

5 Jan 2022 by Phoenix Liveon

What I did for now was to call/invoked it inside of the first line of one of any constructor, Note: upon by doing it we need to have a delegated constructor if we do had multiple overloaded constructors, so that we could link it together, then...

Create an application using inheritance and polymorphism to implement the software. The application should consist of the following files:

3 Jan 2022 by Mustafa Marri

The Australian cricket team is the best team in the world. The Australian Cricket Board that handles the payment related issues of the players has decided to develop software that would automatically Calculates the income of the players based on...

Java

OOP

Create an application using inheritance and polymorphism to implement the software. The application should consist of the following files:

3 Jan 2022 by OriginalGriff

Java

OOP

[Solved] static and non-static init block in C++

31 Dec 2021 by Richard MacCutchan

You could probably simplify that by the use of the singleton pattern - Google Search[^].

How do I implement hourly paid and fixed salary employee in this code

27 Dec 2021 by Innam Afridi

#include #include using namespace std; class Employee { string name; double hourwork, wage, netsal; public: void getEmployee(string &Name, double &hourWork, double &Wage) { name = Name; ...

C++

OOP

How do I implement hourly paid and fixed salary employee in this code

27 Dec 2021 by KarstenK

You didnt read the tutorial I advised you. You need to create an instance of the employee and fill its members. Write a member function of the class and use it. Use the debugger to understand your code.

C++

OOP

How do I implement hourly paid and fixed salary employee in this code

27 Dec 2021 by OriginalGriff

Quote: First I tried if else but did'nt work and changed the code 6th time still it does not give the result according to the question Making random changes isn't going to get you anywhere: you need to sit down and think before you even start to...

C++

OOP

How do I implement hourly paid and fixed salary employee in this code

27 Dec 2021 by Richard MacCutchan

You already posted this question at I have a project on OOP C++ to code a program on salary.[^]. Please do not repost. If you have additional information then please use the Improve question link in the original post, and add the details there.

C++

OOP

I have a project on OOP C++ to code a program on salary.

26 Dec 2021 by Innam Afridi

Q.No.1: A company pays its employees on a weekly basis. The employees are of two types: 1. Salaried Employees 2. Hourly Employees Salaried employees are paid with a fixed weekly salary, regardless of the number of hours they worked. Fix week...

C++

OOP

I have a project on OOP C++ to code a program on salary.

26 Dec 2021 by KarstenK

Start with some Learn C++ tutorial to learn the language and think over your task. Best is to make some sketch about all functions and members. You may end up with an Employee class which has a boolean for hourly pay, so you can use an if-else...

C++

OOP

I have a project on OOP C++ to code a program on salary.

26 Dec 2021 by k5054

Innam Afridi wrote: don't know how to code. That's a problem. This site assumes that you know how to code, and have at least attempted to try to solve the problem. If you don't know how to code, then its time for you to drop this course. Its...

C++

OOP

How might I incorporate strength such that it affects player and monster damage?

21 Dec 2021 by biull smith

If such a request has already been asked, please accept my apologies. I looked for samples, read up on the player and monster classes, and player and monster stats on other sites, and nothing appeared to fit with the game's code without...

How might I incorporate strength such that it affects player and monster damage?

21 Dec 2021 by Gerry Schmitz

You need a "standard" / baseline for inflicting damage; then you vary the damage as the strength varies. e.g. One company (64 men), lying down, open formation, firing, can inflict a loss of 5, in one minute, on the party fired on under similar...

Need help for this sfzsld sfdpoko of code?

19 Dec 2021 by Zhobk

public classffdgd { public String osdfwnerName = “CzzIUsgdz"; public String szbrand; public int zsuzsrrentSzspeed; pritate vosid sdzgccgzdelezgrate(int speed) { ... } pritate void fsdfecelgdesrate(int speed) { ... } pritate void...

Need help for this sfzsld sfdpoko of code?

16 Dec 2021 by Richard MacCutchan

See Lesson: Classes and Objects (The Java™ Tutorials > Learning the Java Language)[^].

Need help for this sfzsld sfdpoko of code?

16 Dec 2021 by OriginalGriff

How can I revise my program to work?

3 Dec 2021 by JacobFish2

I am writing a program similar to peg solitaire. I can not get it to work properly and I have attached all the code that I have so far. Any help/advice is appreciated. The outline of the game is to have the player pick the amount of columns and...

Python

OOP

How can I revise my program to work?

3 Dec 2021 by OriginalGriff

Start by thinking about how you would do in manually: how do you decide if a move will be allowed when you play the game in the real world? Simple: you look beside teh peg you want to move, and check there is a peg there, and that where the peg...

Python

OOP

How do I do to improve my coding ability with VS2019 C# + winform.

15 Nov 2021 by Member 14430889

Example : Input Two Any Value With Int Type, Call Them 'A', 'B'. User Can Input A Positive Value For How Many Times The System Creates A Random Number 'M' , A

WinForms

OOP

How do I do to improve my coding ability with VS2019 C# + winform.

15 Nov 2021 by Member 14430889

Before Fix (Horrible) : using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using...

WinForms

OOP

How do I do to improve my coding ability with VS2019 C# + winform.

7 Nov 2021 by BillWoodruff

In addition to Richard MacCutchan's and OriginalGriff's excellent advice: Break the problem into small steps: 1) create three controls on the Form for text/number entry 1a) verify that you can get valid integer values from those controls: use...

WinForms

OOP

How do I do to improve my coding ability with VS2019 C# + winform.

6 Nov 2021 by OriginalGriff

Quote: I Can Not Totally UnderStand How To Use 'Key' And 'Value' Of List And Dictionary. Lists don't have "Key" or "Value" - dictionaries do because they store two bits of information: a Key which must be unique and a Value which is associated...

WinForms

OOP

Questionnaire type program in C++ with 3 items of questions with oop arrays and loops

31 Oct 2021 by kawaii simp

Questionnaire Type Program in C++ with 3 items of questions. When the user finish answering the 3 items of questions, the program will compute the total number of correct and wrong answer(s). Then, the program will ask if the user want to take...

C++

OOP

Questionnaire type program in C++ with 3 items of questions with oop arrays and loops

23 Oct 2021 by merano99

There's no question, but I'll give you an assumed answer. With cin the variable "answer" is read in, but then "x" is evaluated. The for loop doesn't seem to make any sense. I would put questions and possible answers that the program generates in...

C++

OOP

Questionnaire type program in C++ with 3 items of questions with oop arrays and loops

23 Oct 2021 by Greg Utas

For one thing, studentInfo never assigns a value to age, so it will probably be a random value when displayAnswerQuestionInfo displays it.

C++

OOP

Introduction to Object Oriented Programming Concepts (OOP) and More

9 Oct 2021 by Nirosh

This article helps to understand OOP concepts, focusing on .NET/ C#. This is written in the form of asking questions and writing answers to them, making it easy to understand.

.NET

Architect

OOP

Where does the class of copy constructor in C++ locate

13 Sep 2021 by walied sharkawy

if I have a copy constructor in which the class is being passed by reference for example Move::Move(const Move& source) { data = new int; *data = *source.data; } where is the class of data attribute that I'm copying source.data within...

C++

constructor

OOP

How to reduce quantity of product in SQL

13 Sep 2021 by Richard Deeming

Not like that! Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query. Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^] How can...

OOP

How to reduce quantity of product in SQL

13 Sep 2021 by Member 14961132

private void btnConfirm_Click(object sender, EventArgs e) { string product_id = txtProductID.Text; string product_name = txtProductName.Text; string product_price = txtPrice.Text; string...

OOP

Where is the object of copy constructor in C++ locate is it this pointer ?

12 Sep 2021 by walied sharkawy

I've written a code in which I'm passing class as a parameter in fucntion the copy constructor for the class is written too in the body of the code #include #include using namespace std; class Move { private: int* age;...

Where is the object of copy constructor in C++ locate is it this pointer ?

12 Sep 2021 by CPallini

Quote: I'm wondering where is the object of the (*age) member in the copy constructor body? Quote: I've tried to debug and see locals to see what's going behind I see a pointer variable called this is being created when the constructor is called...

Where does the class of copy constructor in C++ locate

12 Sep 2021 by BernardIE5317

Your ultimate intention is not clear Do you merely want working code or are you investigating memory structures created by the compiler As to your example you will have to delete the destination pointer before assigning it a new value else you...

C++

constructor

OOP

Where is the object of copy constructor in C++ locate is it this pointer ?

12 Sep 2021 by BernardIE5317

It seems to me there is no need to utilize a pointer to store age as shown below If you wish to utilize a pointer you should delete it before copying to it in the copy constructor else you will have memory leakage As to your question if I...

Where does the class of copy constructor in C++ locate

12 Sep 2021 by Rick York

I am not sure I fully understand your question but for that code to work there has to be a declaration like this somewhere : class Move { public: Move(const Move& source); int * data; };

C++

constructor

OOP

OOPS : valueerror: invalid literal for int() with base 10

10 Sep 2021 by Priyanka Somani

Given as input a list of integers nums and an integer k, return the maximum value of each sub-list of length k Example: nums = [4, 8, 2, 4, 10, 12] k = 2 Output = [8, 8, 4, 10, 12] Your task is to create a class named SlidingWindow and implement...

Python3.6

Objective-C

OOP

C++ codes 3 to 4 questions

23 Aug 2021 by Joi Master

Define a class Counter having the attribute count (type int). For the class Counter, implement the following functionalities: (Q8-Q11) Q8. Constructors which allow statements like: Counter c1;//count should be 0 for c1, Counter c2(12);// count...

C++

OOP

C++ codes 3 to 4 questions

23 Aug 2021 by KarstenK

You need to improve your coding skills with some Learn C++ tutorial and write some C++ code with classes. If you use Microsoft Visual Studio you get an assistent which does half of the work for free.

C++

OOP

C++ codes 3 to 4 questions

22 Aug 2021 by Richard MacCutchan

Q8. Create two constructors, one which does not accept any parameters, and a second one which requires an integer value. Q9. Provide the code for an overload of the += operator. Q10. Provide an overload for the two decrement operators. Q11....

C++

OOP

C++ codes 3 to 4 questions

22 Aug 2021 by OriginalGriff

C++

OOP

Write following java program

19 Jul 2021 by Richard MacCutchan

Java Tutorials Learning Paths[^]

Java

OOP

programming

Write following java program

19 Jul 2021 by OriginalGriff

Java

OOP

programming

Anyone can please help me to rectify the following java code ?

17 Jul 2021 by Hemil Shah 2021

I am actually getting " expected " error for parameters passed in methods. What I have tried: import java.util.Scanner; import java.lang.Math; class Quad { int a,b,c; float d,x1,x2; void discriminant( a, b,...

Java

OOP

Anyone can please help me to rectify the following java code ?

17 Jul 2021 by Richard MacCutchan

You need to declare the parameter types in your function definitions: void discriminant( a, b, c) // the compiler cannot guess the types of a, b and c // correct way void discriminant(int a, int b, int c) // tell the compiler the types of the...

Java

OOP

Understanding Association, Aggregation, and Composition

23 Jun 2021 by Shivprasad koirala

In this article we will try to understand 3 important concepts association, aggregation and composition.

How do I write the C++ code of given problem ?

14 Jun 2021 by Zeeshan Mehmood Jun2021

We want to store the information of different vehicles. Create a class named Vehicle with two data member named mileage and price. Create its two subclasses *Car with data members to store ownership cost, warranty (by years), seating capacity...

C++

OOP

How do I write the C++ code of given problem ?

14 Jun 2021 by Richard MacCutchan

class Vehicle { int mileage; int price; };

C++

OOP

How do I write the C++ code of given problem ?

14 Jun 2021 by KarstenK

You need to visit some Learn C++ tutorial and learn basic programming. tip 1: use the std:string class tip 2: write functions for every task tip 3: write tests for all functions and check for correct results

C++

OOP

How to write instanceof in determining the account type of the customer that he/she created?

11 Jun 2021 by Alvin Smith

Hello! I'm new to Java programming and Object-oriented programming. Please help me. I have 6 classes here: Bank, Customer, Account, CheckingAccount, SavingsAccount, and TestBanking. A Bank can have multiple customers(but i initialize the num of...

Java

OOP